Research On Finite Element Analysis Of Heavy-duty Truck Part Chassis Assembly

Along with the accelerating process of economic globalization, our reliance on international energy and raw material market deepens continually, the constant soaring of price on international crude oil and industrial raw material, which results in great burden to our country's economic development, car, as a fuel consumption vehicle, whether it's save or not has directly affected the whole energy-consumption level, our country attaches great importance to it. Because of its great significance, car manufacturers all over the world try their best to lighten the weight of car, the technique of light-weight design has became a hot topic in the research field.The frame, as a most important part of carrier car, supports some accessories such as engine, drive line, running gear, body, and withstands all kinds of force. In addition, the work condition of carrier car is extremely bad, and stress condition is also complex, it is unable to use simple mathematical method for accurate analysis of the calculation, and the finite element method can be used to analyse the static and dynamic performance of the frame more accurately, so that the design of frame will go from the experience design into the scientific design stage.In this paper, with engineering study practice, introduces the basic idea, the theory and method of the FEM, then sets up the modal of frame, axle, leaf spring and analyses their static stiffness and strength, by these work, knows the stress and displacement distribution under many working conditions. Combination the test results of static and dynamic testing of vehicle, compares the FEM modal to the actual structure and amends the modal to ensure its accuracy.Using of the revised model of the frame to carry out modal analysis, extracts of its top ten non-zero-order mode frequency and vibration mode and evaluates the dynamic performance of the frame. By a preliminary topology optimization in order to know the approximate frame transmission route,the local structure of the frame arrangement of the situation, providing the further basis for lightweight design. All the results show that the stiffness and strength of the frame is large margin, so there is space for the lightweight design. Finally, by analogy, in the frame does not change the production process, proposes two improved program, and checks the strength of the improved modal to ensure the frame meet to the design requirements, gets the goal of reducing the weight of the frame. The research of the paper not only resolved the overweight problem of the frame,gained economic benefits and Social benefits in a certain extent, but also reserves a valuable numerical model and relevant technical data for the factory. Meanwhile, the paper uses FEM successfully. Such an attempt is valuable both in academic research and in practical technology.